Advanced Materials Research Vols. 807-809

Abstract: The project of rural drinking water safety project mainly involves three types of investors as the government, market investors and farmers. Starting from the behavioral characteristics of the investors, using game method of symmetric information and asymmetric information, this paper constructs mathematical model describing decision-making process through game between government and farmers, government and market investors and central government and local government in rural drinking water safety project.

Abstract: A three dimensional mathematical model was used to simulates water temperature structure of a model reservoir under the southwest plateau climate and the subtropics monsoon climate separately. The calculated result shows that: 1. in the Southwest plateau climatic region, obvious double convection was noticed of the surface water, while single convection appears in subtropics monsoon climatic region. 2. Thermal stratification in tropics monsoon climatic region is steadier than the southwest plateau climatic region. 2. In the subtropics monsoon climatic region the water temperature difference between discharge and natural water is more remarkable than the Southwest plateau climatic region, namely that in the subtropics monsoon climatic region the impact of discharge water on downstream water temperature is more appreciable. The research conclusion may provide reference and the basis for the contrastive analysis of related achievement in reservoir water temperature and the water environment.

Abstract: Natural Leymus Chinensis evapotranspiration in the Otindag sandy area under shallow ground-water level condition is calculated based on Soil-Water-Atmosphere-Plant (SWAP) Model developed by Wageningen Agricultural College. The observed values in open test and interior experiment, the meteorological observation and crop index, and the data of soil volumetric moisture content in 2005, are used to calibrate parameters of SWAP model, determine and check out the water transfer parameters of SWAP model with soil volumetric moisture content in 2006. The result shows that SWAP model has high precision and can be use to simulate evapotranspiration under shallow groundwater level condition.

Abstract: Experiment was executed to plant eco-grass of Bromus inermis Leyss on 15°bare slopes, and study effect of biological characters on dynamics of soil moisture contents. The results indicated that vegetation restored quickly on the bare slope after the eco-grass planted. There were 2473.4 kg/hm² of overground biomass and 1744.1kg/hm² of underground biomass, and 70% of underground biomass was in 0-10cm layer of soil. Meanwhile, there was a regulatory mechanism of soil moisture content for Bromus inermis Leyss. When rainfall was enough, soil moisture content in 0-80 cm layer could reach to the most of 26.83% quickly this year. Next it could decline near to the first value of 19.81% after rainfall stopped, and keep a dynamic balance between 19.48% and 19.96%. Moreover, the regulatory mechanism realized though underground biomass, and was clearer with underground biomass increasing, especially in the 0-40cm layer of soil.

Abstract: This paper introduces several mathematical models in order to analysis and solves the problem of the water shortage in China. Some economic strategies have been concluded for government. The strategies include adjusting water fee, constructing reservoirs and water transfer.

Abstract: Since remote sensing technology introduced into China, has made considerable progress in the dynamic monitoring of soil and water loss research. Through the application of remote sensing technology in soil erosion monitoring in our country and other countries, analyze the existing problems in the remote sensing technology application, then make prospects for the application and development.

Abstract: An indigenous Pseudomonas sp., isolated from the heavily petroleum-contaminated soil and identified as Pseudomonas plecoglossicida, was evaluated for its aerobic cometabolic removal of mixture of two representative chlorinated aliphatic hydrocarbons (CAHs), cis-1,2-dichloroethylene (cis-DCE) and trichloroethylene (TCE), with BTEX/toluene provided as substrate in a laboratory-scale soil slurry. The aerobic simultaneous bioremoval of the cis-DCE/TCE/BTEX mixture was studied under different conditions. Results showed that the increased BTEX concentration from 400 to 600 mg/kg prolonged the bioremoval of BTEX. The cometabolism of cis-DCE and TCE was significantly greater when toluene was provided as growth substrate compared to the BTEX mixture as substrates. Additionally, the bioremoval of toluene in the treatment with toluene as sole growth substrate was higher compared to the treatment with BTEX mixture as substrate. Results would enhance the applicability of bioremediation technology to the mixed wastes-contaminated sites.

Abstract: Temporary dams can be formed by the sudden injection of debris flow into main stream for some favorable geomorphologic and hydraulic conditions, which would result in extensive inundations upstream and catastrophic floods downstream due to dam breach and consequently dramatic changes of channel and valley. Expeditious means of assessing potential of dam-forming are necessary, particularly in geological active regions. The complete blockages or dam-forming significantly relate to the discharge ratio and velocity ratio between tributary and main stream, bulk density of debris flow, confluent angles and evenness degree of grain sizes.

Abstract: The complexity of Groundwater dynamic was determined based on the fractal dimensions of groundwater depth sequence of all farms in Jiansanjiang calculated in Grassberger-Procaccia algorithm. It is showed that groundwater dynamic in Jiansanjiang is of certain complexity for fractal dimensions of all wells greater than 1. The complexity of groundwater in Jiansanjiang has a significant spatial variance structure characterized with the complexity of groundwater dynamic in the northwest lower than that in southeast, which indicates that the groundwater system in the southeast fluctuates more strongly and affected by natural and human disturbances more seriously.

Abstract: Xigeda Formation layer, which is widely distributed in Panzhihua area, is researched by the method of γ spectrum measurement. Qinglongshan Xigeda Formation profile is measured by the low-background multi-channelγenergy spectrometer in Panzhihua, the change rules of radioactive elements, including URa, Th, K, Ir and Ira on the profile are analyzed in detail. The characteristics and palaeoenvironmental significance of the sediment layer on the profile is researched by combining the geological features. The results show that the contents of radioactive elements in Xigeda Formation profile reduce obviously from the old to the new layer and change regularly and the radioactive characteristics are consistent to the sediment geological features. All these show that the γ spectrum method is a good one for the study of lake sediment and palaeoenvironment.